import React, { Component } from 'react'
//引入store，用于获取状态
import store from '../../redux/store'
import {createIncrementAction,createDecrementAction,createIncrementAsyncAction,} from '../../redux/count_actions'

export default class Count extends Component {

  increment=()=>{
    const { value } = this.selectNumber
    store.dispatch(createIncrementAction(value*1))
  }

  decrement=()=>{
    const { value } = this.selectNumber
    store.dispatch(createDecrementAction(value*1))

  }

  incrementIfOdd=()=>{
    const { value } = this.selectNumber
    if(store.getState()%2===1) store.dispatch(createIncrementAction(value*1))
  }

  incrementAsync=()=>{
    const { value } = this.selectNumber
    setTimeout(()=>{
      store.dispatch(createIncrementAsyncAction(value*1))
    },1000)
  }

  componentDidMount(){
    store.subscribe(()=>{
      this.setState({})
    })
  }

  render() {
    return (
      <div>
        <h1>当前求和为：{store.getState()}</h1>
        <select ref={e=>this.selectNumber=e}>
          <option value="1">1</option>
          <option value="2">2</option>
          <option value="3">3</option>
        </select>&nbsp;
        <button onClick={this.increment}>+</button>&nbsp;
        <button onClick={this.decrement}>-</button>&nbsp;
        <button onClick={this.incrementIfOdd}>当前求和为奇数再加</button>&nbsp;
        <button onClick={this.incrementAsync}>异步加</button>&nbsp;
      </div>
    )
  }
}
